52. For what purpose has a global campaign been launched?
A) To reduce the impact of climate change on Antarctica.
B) To establish conservation areas in the Antarctic region.
C) To regulate krill fishing operations in the Antarctic seas.
D) To publicise the concern about the impact of krill fishing.
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53. What is Greenpeace's recommendation to the krill industry?
A) Opting to operate away from the suggested conservation areas.
B) Volunteering to protect the endangered species in the Antarctic.
C) Refraining from krill fishing throughout the breeding season.
D) Showing its sense of responsibility by leading the global campaign.
54. What did CCAMLR aim to do according to its science manager?
A) Raise public awareness of the vulnerability of Antarctic species.
B) Ban all commercial fishing operations in the Southern Ocean.
C) Keep the penguin colonies from all fishing interference.
D) Sustain fishing without damaging the Antarctic ecosystem.
55. How does CCAMLR define its role in the conservation of the Antarctic environment?
A) A coordinator in policy discussions.
B) An authority on big data analysis.
C) A provider of the needed expertise.
D) An initiator of marine sanctuaries.
甲类功放效率低是因为
A. 只有一个功率管
B. 静态电流过大
C. 管压降过大
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